Bulk and surface molecular orientation distribution in injection-molded liquid crystalline polymers: Experiment and simulation

2010 ◽  
Vol 50 (9) ◽  
pp. 1864-1877 ◽  
Author(s):  
Jun Fang ◽  
Wesley R. Burghardt ◽  
Robert A. Bubeck ◽  
Susan M. Burgard ◽  
Daniel A. Fischer
Keyword(s):  
Molecular Orientation ◽  
Liquid Crystalline ◽  
Liquid Crystalline Polymers ◽  
Orientation Distribution ◽  
Crystalline Polymers ◽  
Injection Molded ◽  
Experiment And Simulation

Real-Time 1−2 Plane SAXS Measurements of Molecular Orientation in Sheared Liquid Crystalline Polymers

2001 ◽  
Vol 34 (19) ◽  
pp. 6684-6694 ◽  
Author(s):  
Franklin E. Caputo ◽  
Wesley R. Burghardt
Keyword(s):  
Real Time ◽  
Molecular Orientation ◽  
Liquid Crystalline ◽  
Liquid Crystalline Polymers ◽  
Crystalline Polymers

Investigation of Structure-Property Relationships Between Crystal Orientation and Dielectric Behavior in Liquid Crystalline Polymers

2017 ◽  
Author(s):  
Anthony Sullivan ◽  
Anil Saigal ◽  
Michael A. Zimmerman
Keyword(s):  
High Performance ◽  
Liquid Crystalline ◽  
Driving Forces ◽  
Liquid Crystalline Polymers ◽  
Dielectric Behavior ◽  
Dielectric Anisotropy ◽  
Shear Direction ◽  
Structure Property ◽  
Crystalline Polymers ◽  
Injection Molded

Liquid crystalline polymers (LCP’s) make up a class of high performance materials, which derive favorable mechanical, chemical, and electrical characteristics from their long-range molecular order. The unique LCP microstructure gives rise to anisotropic bulk behavior and an understanding of the driving forces behind this morphology is essential to the design of manufacturing processes for isotropic material production. In this investigation, the crystalline orientation in injection molded LCP plaque samples was measured using 2D wide-angle x-ray scattering (WAXS). The direction of preferred alignment was observed from the WAXS scattering patterns and the degree of orientation in the material was quantified using an order parameter and an anisotropy factor. In addition, the dielectric constant was measured with respect to the mold direction (MD) and transverse direction (TD). To investigate the effects of processing on hierarchal structure in the material, and the resulting macroscopic properties, plaques of two different thicknesses were analyzed, both as-injection molded and with the skin layer mechanically removed. It is shown that preferred orientation along the shear direction in the LCP samples corresponds to dielectric anisotropy, and increasing sample thickness, or conversely, mechanically removing the shear aligned layer, results in a more isotropic dielectric response.

Effect of magnetic field on molecular orientation of nematic liquid crystalline polymers under simple shear flow

2008 ◽  
Vol 52 (2) ◽  
pp. 451-468 ◽  
Author(s):  
Shufang Fu ◽  
Tomohiro Tsuji ◽  
Shigeomi Chono
Keyword(s):  
Magnetic Field ◽  
Shear Flow ◽  
Simple Shear ◽  
Molecular Orientation ◽  
Liquid Crystalline ◽  
Liquid Crystalline Polymers ◽  
Simple Shear Flow ◽  
Crystalline Polymers

Molecular orientation of paramagnetic metal complexes in melt-drawn fibers of thermotropic liquid crystalline polymers

1996 ◽  
Vol 197 (6) ◽  
pp. 1853-1864 ◽  
Author(s):  
Kenji Hanabusa ◽  
Masami Hashimoto ◽  
Mutsumi Kimura ◽  
Toshiki Koyama ◽  
Hirofusa Shirai
Keyword(s):  
Metal Complexes ◽  
Molecular Orientation ◽  
Liquid Crystalline ◽  
Liquid Crystalline Polymers ◽  
Crystalline Polymers ◽  
Thermotropic Liquid Crystalline Polymers ◽  
Paramagnetic Metal
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